If you're handy and just want to hang a new door yourself, know what you're dealing with first. A house built around 1948 usually wasn't framed for a modern sectional door - the rough opening may be narrower, the header may not have room for today's standard track radius, and the jamb studs are often true wood, not the doubled framing you'd find in something built in the 1980s. That's workable, but it means measuring twice before you order anything, and it means the trim work afterward is real carpentry, not just caulk and paint. Springs and cables on a new install are not a place to save money by going it alone - a torsion spring under load has put people in the hospital. If you're set on doing the panel hang yourself, we're glad to talk through what a straight, square opening should look like before you start. If the opening's out of square by more than a small amount, that's the point where a DIY install turns into a rebuild, and that's worth knowing before you buy a door.